40G QSFP+ Passive DAC Twinax Copper Cable (0.5-5m): 40G-PDAC-QSFP
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Same use case, different specifications
40G QSFP+ Passive DAC Cable Overview
The 40G-PDAC-QSFP is a passive QSFP+ to QSFP+ direct attach twinax copper cable built to the QSFP+ MSA (SFF-8436) and IEEE 802.3ba 40GBASE-CR4 specification. It carries a 2.125 to 41.2 Gbps data rate envelope on a single physical link, covering 10G and 40G Ethernet, 2G, 4G, 8G and 10G Fibre Channel, and SDR, DDR and QDR InfiniBand. The cable is available in eight lengths: 0.5m, 1m, 1.5m, 2m, 2.5m, 3m, 4m and 5m. The 0.5m to 4m lengths use AWG30 conductors, and the 5m length steps to AWG26 to help preserve signal integrity over the longer run. As a passive interconnect, it needs no external power and adds no active-electronics latency. Digital diagnostic monitoring reports temperature and supply voltage over the QSFP+ management interface, and the cable operates across the standard 0 to 70°C range with an MTBF rating of 1,000,000 hours. Compliance covers CE, RoHS, the QSFP+ MSA, SFF-8436, IEEE 802.3ba and QDR InfiniBand.
- Cable Type: Passive Direct Attach Cable (PDAC)
- Cable Configuration: Point-to-Point
- Connector Type: QSFP+ to QSFP+
- Supported Data Rate: 2.125 Gbps - 41.2 Gbps
- Maximum Distance: 5 m
- AWG (Wire Gauge): AWG30 (0.5-4m) | AWG26 (5m)
- DDM/DOM: Supported
- Temperature Range: Standard 0°-70°C
- MTBF: 1000000 hours
40G QSFP+ Passive DAC Pricing
SKU:40G-PDAC-QSFP40G-PDAC-QSFP
Made to Order - 2 WeeksMade to Order - 2 Weeks40G QSFP+ Passive DAC Twinax Copper Cable (0.5-5m) Specification
Cable Type | Passive Direct Attach Cable (PDAC) |
Cable Configuration | Point-to-Point |
Connector Type | QSFP+ to QSFP+ |
Supported Data Rate | 2.125 Gbps - 41.2 Gbps |
Supported Ethernet Applications | 10G Ethernet (10.31Gbps), 40G Ethernet (41.25Gbps) |
Supported Fiber Channel Applications | 2G Fiber Channel (2.125 Gbps), 4G Fiber Channel (4.25 Gbps), 8G Fiber Channel (8.5 Gbps), 10G Fiber Channel (10.52 Gbps) |
Supported InfiniBand Applications | InfiniBand SDR (10 Gbps), InfiniBand DDR (20 Gbps), InfiniBand QDR (40 Gbps) |
Maximum Distance | 5 m |
Media Type | Twinax Copper Cable |
AWG (Wire Gauge) | AWG30 (0.5-4m) | AWG26 (5m) |
DDM/DOM | Supported |
Temperature Range | Standard 0°-70°C |
MTBF | 1000000 hours |
Compliance | CE, RoHS, QSFP+ MSA, SFF-8436, IEEE 802.3ba, QDR InfiniBand |
40G QSFP+ Passive DAC Twinax Copper Cable (0.5-5m) Datasheet
v3Complete technical specifications and product details
40G QSFP+ Passive DAC Twinax Copper Cable (0.5-5m) Description
The 40G-PDAC-QSFP is a passive QSFP+ to QSFP+ direct attach twinax copper cable built to the QSFP+ MSA (SFF-8436) and IEEE 802.3ba 40GBASE-CR4 specification. As a passive interconnect, it uses no active electronics and needs no external power, so the added latency is limited to the physical propagation delay of the copper pair.
The data rate envelope spans 2.125 to 41.2 Gbps, covering 10G and 40G Ethernet, 2G, 4G, 8G and 10G Fibre Channel, and SDR, DDR and QDR InfiniBand on the same point to point QSFP+ to QSFP+ configuration. Lengths run from 0.5m to 5m across eight variants; the 0.5m to 4m lengths use AWG30 conductors, and the 5m length steps to the heavier AWG26 to hold signal integrity over the longer run.
Digital diagnostic monitoring is supported over the QSFP+ management interface, reporting temperature and supply voltage, and the cable operates across the standard 0 to 70°C range with an MTBF rating of 1,000,000 hours. Compliance covers CE, RoHS, the QSFP+ MSA, SFF-8436, IEEE 802.3ba and QDR InfiniBand.
The point to point QSFP+ to QSFP+ configuration fits short direct links between adjacent switches, servers or storage controllers in the same rack or an adjacent rack, replacing a pair of optical transceivers and a fiber patch for a short run.
This design underlies EdgeOptic's vendor specific compatible listings; select the page for the matching switch, server or storage vendor for exact ordering details. For volume quantities or custom length requirements, contact our sales team.
Frequently Asked Questions
Does the 40G-PDAC-QSFP support Ethernet, Fibre Channel, and InfiniBand on the same cable?
The data rate envelope, 2.125 to 41.2 Gbps, covers 10G and 40G Ethernet, 2G, 4G, 8G and 10G Fibre Channel, and SDR, DDR and QDR InfiniBand, so the same part number applies across all three protocol families. As a passive cable, it carries whatever electrical signal the connected QSFP+ ports generate rather than converting between protocols, so each end of the link negotiates a single protocol and rate that both host ports support.
Can a QSFP28 direct attach cable substitute for the 40G-PDAC-QSFP in a QSFP+ 40G port?
QSFP28 direct attach cables are generally engineered to be electrically backward compatible with QSFP+ host ports, since QSFP28 is a superset of the QSFP+ form factor. This is common industry design practice rather than a guarantee specified by any single standard, so verify the specific QSFP28 cable's downshift behavior and the target platform's transceiver compatibility list before substituting it for the 40G-PDAC-QSFP.
Why does the 5m 40G-PDAC-QSFP use AWG26 while the shorter lengths use AWG30?
The 0.5m through 4m lengths use AWG30 conductors. At 5m, the longest length this cable ships in, the design steps to the heavier AWG26 gauge to help preserve signal integrity over the extra run length. The 5m variant is also the maximum length offered for this SKU; order one of the shorter AWG30 lengths (0.5m to 4m) if the run fits within that range.